Quarterly report pursuant to Section 13 or 15(d)

BUSINESS COMBINATIONS - Assets acquired and liabilities assumed (Details)

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BUSINESS COMBINATIONS - Assets acquired and liabilities assumed (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]    
Goodwill $ 665,645 $ 653,176
Acquisitions    
Business Acquisition [Line Items]    
Accounts receivable, net 1,013  
Materials and supplies 231  
Equipment and property 2,352  
Goodwill 15,520  
Current liabilities (362)  
Other assets and liabilities, net 234  
Total consideration paid 44,781  
Less: Contingent consideration liability (5,089)  
Total cash purchase price 39,692  
Acquisitions | Customer Contracts, Net    
Business Acquisition [Line Items]    
Intangible assets 25,450  
Acquisitions | Trademarks & Tradenames, Net    
Business Acquisition [Line Items]    
Intangible assets 200  
Acquisitions | Other Intangible Assets, Net    
Business Acquisition [Line Items]    
Intangible assets $ 143